Cream Sauce For Fish Or White Dishes
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Ingredients
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1/3 pint of cream, 2 oz. of butter, 1 teaspoonful of flour, salt and cayenne to taste; when liked, a small quantity of pounded mace or lemon-juice.

Method
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Put the butter in a very clean saucepan, dredge in the flour, and keep shaking round till the butter is melted. Add the seasoning and cream, and stir the whole till it boils; let it just simmer for 5 minutes, when add either pounded mace or lemon-juice to taste, to give it a flavour.

Source: Mrs Beeton's Book of Household Management (1861)
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